// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// Customized ECOM resolver for XML plugin parsers

// 

//

/**

 @file

 @internalComponent

*/

#include <e32std.h>

#include <ecom/implementationinformation.h>

#include <xml/xmlframeworkerrors.h>

#include <xml/xmlframeworkconstants.h>

#include <xml/matchdata.h>

#include "customresolver.h"

using namespace Xml;

/**

Class constructor.

@param aRegistry Gives the resolver access to a list of implementations of an interface.

*/

CCustomResolver::CCustomResolver(MPublicRegistry& aRegistry)

	:CResolver(aRegistry)

{

}

/**

Creates the instance of CCustomResolver class. 

@param aRegistry Gives the resolver access to a list of implementations of an interface.

@leave KErrNoMemory If there is not enough memory to create an object

*/

CCustomResolver* CCustomResolver::NewL(MPublicRegistry& aRegistry)

{

	return new (ELeave) CCustomResolver(aRegistry);

}

/**

Object destructor.

*/

CCustomResolver::~CCustomResolver()

{

}

/**

Identifies required parsers. 

@param aInterfaceUid 			Interface UID of required parser

@param aAdditionalParameters	Additional parameters for parser resolver 

@return Parser's Uid or KNullUid if parser isn't found. 

@leave KErrNoMemory 			If there is not enough memory to create 

							necessary objects

@leave KErrArgument 			If incorrect or partial information is provided 

							for parser resolution

@leave KErrXmlMoreThanOneParserMatched 	

							If Xml framework narrowed down the query 

							to many parsers and a user requested to leave 

							in such case (LeaveOnMany flag set). 

*/

TUid CCustomResolver::IdentifyImplementationL(TUid aInterfaceUid, const TEComResolverParams& aAdditionalParameters) const

{

	// Unpack user matching criteria.

	// Externalized CMatchData object is stored in a heap based buffer as a stream. 

	// Buffer pointer is stored in data type attribute of aAdditionalParameters

	// Specialized NewL method creates a CMatchData object based on that pointer. 

	CMatchData* criteria = CMatchData::NewL(aAdditionalParameters.DataType());

	CleanupStack::PushL(criteria);

	// Verify input data

	// Mime type string is a mandatory field for parser resolution

	if (criteria->MimeType().Length() == 0 )

		User::Leave(KErrArgument);

	// This method is designed for plugin parser resolution only

	if (aInterfaceUid != KParserInterfaceUid)

		User::Leave(KErrArgument);

	// Use the CResolver method to create an array, so that we get proper cleanup behaviour

	RImplInfoArray& implInfo = CResolver::ListAllL(aInterfaceUid);

	// Run the resolution process

	TUid uid = criteria->ResolveL(implInfo);

	//clean up

	CleanupStack::PopAndDestroy(criteria);

	implInfo.Close();

	return uid;

}

/**

The ListAllL method is not supported by this customized resolver.

@leave KErrNotSupported 

*/	

RImplInfoArray* CCustomResolver::ListAllL(TUid /*aInterfaceUid*/, const TEComResolverParams& /*aAdditionalParameters */) const

{

	User::Leave(KErrNotSupported);

	return NULL; 

}